I have often read posts in the forum that I've found incredibly helpful but I have never actually posted. I usually find that someone here has the answer without me having to, however in this case I fear the culprit causing my rhododendron dieback could be a couple of offenders so I was wondering if you could help me.
I have attached a few images of a rhododendron and an azalea which are positioned in a South facing garden but are shaded by a tall fence and the rear wall of the house. They grew happily here for many years however I noticed that they started to experience die back last year which I put down to an over eager clematis that had started to tangled through their branches. In spring of this year, I dug up the offending clematis and repositioned it at the front of the house. I was hoping the 2 shrubs would recover once it had been removed, however as you can see the only signs of new growth are on the unaffected branches.
I am now concerned that the dieback is being caused by something else. The azalea's leaves are showing symptoms of a possible fungal infection. I am no expert so wondered if you could diagnosis the issue from the provided photographs and possibly advise the best way to help these plants to recover, presuming I haven't left it too late.